using COPY_FILE only with cmake 3.21+ where it is introduced (#1318)

Merge as the iOS build issue is unrelated.

Author: ipraveenMS

tests/functests/CMakeLists.txt

@@ -35,7 +35,14 @@ if (EXISTS ${CMAKE_SOURCE_DIR}/lib/modules/exp/tests)
         ${CMAKE_SOURCE_DIR}/lib/modules/exp/tests/functests/ECSConfigCacheFuncTests.cpp
         )
     if (EXISTS ${CMAKE_SOURCE_DIR}/lib/modules/exp/tests/functests/test.json)
-      file(COPY_FILE ${CMAKE_SOURCE_DIR}/lib/modules/exp/tests/functests/test.json ${CMAKE_BINARY_DIR}/test.json)
+      if(${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.21")
+        # Use file(COPY_FILE ...) for CMake 3.21 and later
+        file(COPY_FILE ${CMAKE_SOURCE_DIR}/lib/modules/exp/tests/functests/test.json ${CMAKE_BINARY_DIR}/test.json)
+      else()
+        # Use file(COPY ...) as an alternative for older versions
+        file(COPY ${CMAKE_SOURCE_DIR}/lib/modules/exp/tests/functests/test.json
+          DESTINATION ${CMAKE_BINARY_DIR})
+      endif()
     endif()
 endif()